Improvement in ore-grinders



inted Startet JOSEPH W. v. EAWLINS AND SAMUEL STEPHENS, oF HoUGHToN @stint tiljine.

t MICHIGAN.

Letters .Patent No. 94,771, dated September 14, 1869.

The Schedule` referred to in these Letters Patent and makrihg part of the lame.

To all whom fit may concern Be it -knownthat we, JOSEPH W. V. RAWnrNs and- SAMUEL STEPHENS, of Houghtominthe county of Houghton, and State of Vlli'lichigan, have invented a new and improved OreGrinder; and 'we'do hereby declare that the following is a full, clear, and exact 'description thereof', which will enable others skilled in theartto make and use the same, reference being had to the accompanying drawings, forming part of this specification. h

The object of this invention' is to provide a simple and efficient machine for grinding ores.

It consists of an arrangement of crusliers or grinders,

suspended adjustably from a revolving plate, -so as to project'into a tub` or moitar, into which the ore is fed A represents a'tub or mortar, which may be made i of wood, metal, or other substance, and provided with `a detachable metallic bottom, B, preferably made of chilled cast-iron.

We prefer, also, to elevate the permanent bottom of the tub at the centre, as at C, and make a 'central opening in the detachable bottom to fit the said elevation, and We make curved ianges, D, bothat the inner and outer vmarginsof the said bottomson the upper face. l

rlhrough the centre of the mortar rises a vertical revolving shaft, E, whereonis adj ustably supported at the top, a stron g circular plate or disk, F, and from this are suspended, on rigid but Vadjustable arms, G, two sets of crushers, H I the one, .1, formed so as to ride over the large lumps and crush them down, while the other set, H, is provided with sharp vertical' edges,

and arranged to Wedge the ore ou each side against the walls of the tub, also to split and crush those pieces against which the'pointsstrike. They are pointed at both ends, and may be turned to present either end to the front. t

This plate F is fitted over the top of the shaft E,

by a central hole, and is provided with a yoke, through which an` adjusting screw, L, works upon the top of the shaft to adjust the plate up or down.

The rods G, which support the gcrushers, are provided with adjusting nuts above and below the plate F, for adjusting them. g

The plate F is designed, to be loaded with weights,

M, according to the quality of the work in hand, and

the weights may be supported on vertical pins, N.

The shaft E and plate F-,are operated Yby power applied at the bottom, from a driving-shaft, O.

For feeding, the broken ore is placed in au elevated hopper, P, having an opening in one side, above the bottom, through which revolving feeding-arms, Q, project as they'swing around on a revolving shafalt, also operated bythe shaft O, and sclape out the lumps in the desired quantities into the feeding-trough S, through which the water used in the lmortar to soften the ore is alsc fed from the spout S.

The water carries the ore through the said spout S, which terminates-in a vertical passage, V, in the side of the tub, opening laterally into the said tub at V, under the crusher I.

W represents the discharge-passage, in front of which I.

magnets, X, are suspended in a spout, Y, having adjustablev gates, Z, to regulate the height of `water in the I nortar.

The magnets are designed to separate the iron from the crushed Iore as it passes o' with the water.

Having thus described our invention- We claim as new, and desire to secure by Letters Patent- 1. The combination, with the mortar A, having the detachable bottom B, of the revolving crushers H I, suspended adjustably from the revolving shaft E, when arranged substantially as specified.

l2. rlhe arrangement of the hopper P, spouts S and and S', feeding-arms Q, and mortar A, all substantially as specified. p

3. The combination,=with the mortar and crnshers, of the weights M, detachably connected to the plate F, all substantially as specied.

JOSEPH W. V. RAWLINS.

SAMUEL STEPHENS.

I Witnesses:

SETE BEES, J. P. EDWARDS. 

